TY  - GEN
AU  - Yonemura, Gary T
AU  - Benson, William M
AU  - Tibbott, Robert
C2  - , National Institute of Standards and Technology, Gaithersburg, MD
DA  - 1977-01-01 05:01:00
DO  - https://doi.org/10.6028/NBS.IR.77-1306
LA  - en
PB  - , National Institute of Standards and Technology, Gaithersburg, MD
PY  - 1977
TI  - Levels of illumination and legibility:
ER  -